AT9706 stain,obtained from apple trees,had 100% inhibition to Valsa mali、Physalospora piricola and Botryosphaerla dothidea. The 100 times of antibiotic of AT9706 stain had 96.6%and 96.7%and 99.2% inhibition to Valsa mali et al.The control effect were 79.0% and 78.3% to Valsa mali and physalospora piricola by spraying in the field.